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package pin
import (
"fmt"
"io"
"github.com/cilium/ebpf"
"github.com/cilium/ebpf/internal/sys"
"github.com/cilium/ebpf/link"
)
// Pinner is an interface implemented by all eBPF objects that support pinning
// to a bpf virtual filesystem.
type Pinner interface {
io.Closer
Pin(string) error
}
// Load retrieves a pinned object from a bpf virtual filesystem. It returns one
// of [ebpf.Map], [ebpf.Program], or [link.Link].
//
// Trying to open anything other than a bpf object is an error.
func Load(path string, opts *ebpf.LoadPinOptions) (Pinner, error) {
fd, typ, err := sys.ObjGetTyped(&sys.ObjGetAttr{
Pathname: sys.NewStringPointer(path),
FileFlags: opts.Marshal(),
})
if err != nil {
return nil, fmt.Errorf("opening pin %s: %w", path, err)
}
switch typ {
case sys.BPF_TYPE_MAP:
return ebpf.NewMapFromFD(fd.Disown())
case sys.BPF_TYPE_PROG:
return ebpf.NewProgramFromFD(fd.Disown())
case sys.BPF_TYPE_LINK:
return link.NewFromFD(fd.Disown())
}
return nil, fmt.Errorf("unknown object type %d", typ)
}
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